Which of the following does not represent electrical power in a circuit? (a) I2R (b) IR2 (c) VI (d) V2/R

Answer: b) IR²

Explanation:

Electrical power is given by the expression P = VI. (1)

According to Ohm’s law,

V = IR

Substituting the value of V in (1), we get

P = (IR) × I

P = I²R

Similarly, from Ohm’s law,

I = V/R

Substituting the value of I in (1), we get

P = V × V/R = V²/R

From this, it is clear that the equation IR² does not represent electrical power in a circuit.